U.S. patent number 5,569,026 [Application Number 08/377,223] was granted by the patent office on 1996-10-29 for tube pump in which tube can be inserted only in one direction.
This patent grant is currently assigned to Storz Endoskop GmbH. Invention is credited to Pavel Novak.
United States Patent |
5,569,026 |
Novak |
October 29, 1996 |
Tube pump in which tube can be inserted only in one direction
Abstract
A tube pump for conveying liquid or viscous media, with a pump
head on which at least two pump rollers are arranged which latter
can act in succession on a tube, carrying the medium to be conveyed
and located in the tube bed, in such a way that the medium is
transported by squeezing the tube tightly, wherein the tube bed and
the tube are fashioned so that the tube can be inserted in the tube
bed in only one direction. This can be achieved by using end pieces
of differing geometric forms and/or sizes, and/or providing that
one end piece is magnetic and providing a magnetic sensor in the
corresponding socket of the tube bed.
Inventors: |
Novak; Pavel (Schaffhausen,
DE) |
Assignee: |
Storz Endoskop GmbH
(Schaffhausen, DE)
|
Family
ID: |
25959618 |
Appl.
No.: |
08/377,223 |
Filed: |
January 24, 1995 |
Related U.S. Patent Documents
|
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
77770 |
Jun 18, 1993 |
|
|
|
|
Foreign Application Priority Data
|
|
|
|
|
Jun 18, 1992 [DE] |
|
|
9208212 U |
|
Current U.S.
Class: |
417/477.1;
417/477.2; 604/153 |
Current CPC
Class: |
A61M
5/142 (20130101); F04B 43/08 (20130101); F04B
43/12 (20130101); A61M 2205/6045 (20130101) |
Current International
Class: |
A61M
5/142 (20060101); F04B 43/08 (20060101); F04B
43/12 (20060101); F04B 43/00 (20060101); F09B
043/08 () |
Field of
Search: |
;417/474,476,477.1,477.2
;604/151,153 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Korytnyk; Peter
Attorney, Agent or Firm: Antonelli, Terry, Stout &
Kraus
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part application of prior
application Ser. No. 08/077,770, filed Jun. 18, 1993, now
abandoned.
Claims
What is claimed:
1. A tube pump, comprising:
a tube for conveying liquid or viscous medium therethrough, the
tube including two end pieces, wherein each of the end pieces has a
cylindrical geometric form, one of the end pieces being larger than
another of the end pieces; and wherein at least one of the end
pieces exhibits an additional coding in the form of at least one
continuous groove;
a tube bed having a pair of sockets, one of the sockets being
larger than another of the sockets, whereby the end pieces can be
installed in the sockets in only one possible combination;
a sensor provided in at least one of the sockets for identifying
the additional coding of at least one of the end pieces; and
a pump head on which at least two pump rollers are arranged, the
pump rollers acting in succession on and squeezing the tube to
convey the medium therethrough in one direction.
2. A tube pump according to clam 1, wherein at least one of the end
pieces comprises a magnetic material and wherein at least one of
the sockets is provided with a magnetic sensor for detecting if the
end piece comprising the magnetic material is installed
therein.
3. A tube pump according to claim 1, wherein the sensor is an
optical sensor for identifying the additional coding and wherein
different operating parameters of the tube pump are settable in
correspondence with the additional coding identified.
4. A tube pump according to claim 3, wherein the optical sensor is
a light barrier.
5. A tube pump according to claim 1, wherein the sensor is a
mechanical sensor for identifying the additional coding and wherein
different operating parameters of the tube pump are settable in
correspondence with the additional coding identified.
6. A tube pump according to claim 5, wherein the mechanical sensor
is a microswitch.
Description
SPECIFICATION
BACKGROUND OF THE INVENTION
The invention relates to a tube pump.
Rotary or tube pumps are very frequently utilized in medical
technology for the pumping of blood, blood substitute fluids and/or
irrigation fluids. The conventional tube pumps for the conveying of
liquid or viscous media exhibit a pump head on which at least two
pump rollers are arranged which can be made to act in succession on
a tube, wherein the medium to be conveyed is provided and which is
located in a tube bed, in such a way that the medium is transported
by squeezing the tube tightly.
In this process, it is usually very important to insert the pump
hose in the pump head in such a way that the pumping direction is
correct since otherwise life-threatening conditions can arise for
the patient, for example by infusion of air which can lead to air
embolism and/or by suction drainage of blood or other body
fluids.
The danger of an inadvertent erroneous insertion of the pump hose
is especially acute in simple systems inasmuch as a corresponding
tube guidance (e.g. dialysis devices) cannot prevent a reversed
insertion of the tube kit so that thus the correct pumping
direction is not observed. Normally, merely an arrow is provided at
the pump head or in its proximity which is to ensure the correct
insertion. Unfortunately, in clinical practice, this is frequently
inadequate.
SUMMARY OF THE INVENTION
The invention is based on the object of further developing a tube
pump of this type in such a way that an insertion of the tube
leading to a pumping direction in opposition to the desired
direction is impossible.
According to the invention, the tube bed and the tube are fashioned
so that the tube can be inserted in the tube bed only in one
direction. This can be achieved, for example, in an especially
simple way by providing that the tube has differently large end
pieces which latter can be inserted only in one combination
possibility in adapted sockets in the tube bed and/or by providing
that at least one end piece of the tube of a magnetic material and
providing a magnetic sensor in the corresponding socket of the tube
bed.
Moreover, at least one of the end pieces can be provided with
additional coding, for example with a groove.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a portion of a tube pump and
FIG. 2 shows various differently coded end pieces.
FIG. 3 shows the use of sensors provided in the sockets.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to the invention, the end pieces 1, 2 of the tube segment
3, which are inserted in the pump head and serve for fixation of
the tube, are fashioned in such a way that a confusion of the
direction becomes impossible.
This can be attained, as illustrated in FIG. 1, in a simple way by
designing the two end pieces 1, 2 to be of different sizes, for
example of differing length, so that, in case of a wrong insertion
of the tube kit in the locating elements of the tube pump, one of
the end pieces cannot be fitted into the corresponding sockets of
the tube pump.
As an alternative or in addition to use of end pieces 1, 2 of
differing sizes, at least one end piece may be made of or provided
with a magnetic material, and the corresponding socket provided
with a magnetic sensor 10 (see FIG. 3). For example, one of the
tube end pieces may be made of a magnetic material and the
corresponding socket provided with a magnetic sensor 10. The sensor
10 can detect whether the tube is inserted correctly or
incorrectly, thereby preventing incorrect insertion, e.g., by
sounding an alarm or preventing operation if incorrect insertion is
detected.
As shown in FIG. 2, an additional coding of the tube kit can be
realized by adding at least one indentation and, in particular, a
continuous groove 4 at one of the end pieces, preferably the larger
one 1 of the two end pieces.
This is advantageous in all those instances when, for example, a
device includes tube kits with different pump tube segment
diameters for the pumping of varying amounts of liquid, wherein
differing operating parameters are to be settable in correspondence
with the tube kit utilized.
In this way, the device can make available to the operator the
correct setting range, automatically and without chance of
confusion, which pertains to the respectively used tube kit, so
that erroneous operations are avoided.
The automatic identification of the indentation or notch mentioned
in the foregoing can be realized by a sensor 12 (see FIG. 3) either
optically (e.g. a light barrier) or mechanically (a correspondingly
designed microswitch).
* * * * *